KERCH, Ukraine (AP) -- Pro-Russian troops took over a ferry terminal on the easternmost tip of Crimea close to Russia today, exacerbating fears that Moscow is planning to bring even more troops into this strategic Black Sea region.
The seizure of the terminal in the Ukrainian city of Kerch about 12 miles by boat to Russia, comes as the West try to figure out ways to halt and reverse the Russian incursion.
Early today, soldiers were operating the terminal, which serves as a common departure point for many Russian-bound ships. The men refused to identify themselves, but they spoke Russian and the vehicles transporting them had Russian license plates.
Troops that Ukraine says are Russian soldiers have occupied airports in Crimea, smashed equipment at an air base and besieged a Ukrainian infantry base in this peninsula.
Outrage over Russia's military moves mounted in world capitals, with U.S. Secretary of State John Kerry calling on President Vladimir Putin to pull back from "an incredible act of aggression."
A day after Russia captured the Crimean Peninsula without firing a shot, fears grew in the Ukrainian capital and beyond that Russia might seek to expand its control by seizing other parts of eastern Ukraine.
Senior Obama administration officials said the U.S. now believes that Russia has complete operational control of Crimea, a pro-Russian area of the country, and has more than 6,000 troops in the region.
Faced with the Russian threat, Ukraine's new government moved to consolidate its authority, naming new regional governors in the pro-Russia east, enlisting the support of the country's wealthy businessmen and dismissing the head of the country's navy after he declared allegiance to the pro-Russian government in Crimea.
Ukrainian Prime Minister Arseniy Yatsenyuk said there was no reason for Russia to invade Ukraine and warned that "we are on the brink of disaster."
"We believe that our Western partners and the entire global community will support the territorial integrity and unity of Ukraine," he said Sunday in Kiev.
In Kiev, Moscow and other cities, thousands of protesters took to the streets to either decry the Russian occupation or celebrate Crimea's return to its former ruler.
"Support us, America!" a group of protesters chanted.
One young girl held up a placard reading: "No Russian aggression!"
"Russia! Russia!" the crowd chanted in Moscow.
So far, however, Ukraine's new government and the West have been powerless to counter Russia's tactics.
Putin has defied calls from the West to pull back his troops, insisting that Russia has a right to protect its interests and those of Russian-speakers in Crimea and elsewhere in Ukraine. His confidence is matched by the knowledge that Ukraine's 46 million people have divided loyalties. While much of western Ukraine wants closer ties with the 28-nation European Union, its eastern and southern regions like Crimea look to Russia for support.
Russia has long wanted to reclaim the lush Crimean Peninsula, part of its territory until 1954. Russia's Black Sea Fleet pays Ukraine millions annually to be stationed at the Crimean port of Sevastopol and nearly 60 percent of Crimea's residents identify themselves as Russian.